Jacob s



UNITED STATES PATENT OFFICEa JAooB s. BROWN, or oARLIsLE, PENNSYLVANIA, AssiGNoR OF ONE-HALE' To wILLIM E. AND JOHN R. MILLER, OF sAME PLAoE.

MEeHANicAL MOVEMENT.`

SPCIFICATION z'orming part of Letters Patent No. 367,888, datel August 9, 1887.

' Application filed January 18, 1887. Serial No. 224,727. (No model.) I

To aZZ whom it may cozzcern:

Be it known that I, JAooB S. BROWN, a citizen of the United States,residing at Carlisle, in the county of Clumberland and State of Pennsylvania, have invented certain new and useful Improvements in Mechanical Movements; and I do hereby declare the following ,to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appert'ains toinake and use the same.

My invention relates to mechanical movements,and partieularly to donble-acting cranks convertible into single-acting cranks; and it consists in the construction and arrangement of the parts of the same, which will be more fully hereinafter described, and pointed out in the claims. p

One object of my invention is. to provide a crank which has a double stroke to one revolution of the wheel in which it is monnted, and which is specially adapted for use in connection with all kinds of well-drilling machines.

A further object 4ofiny invention is to provide a double-acting crank whichis convertible into asingle-acting crank, which is simple and effective in construction and operation, strong and durable, easily handled and operated, readily understood, positive in its desired ultimate result, and cheap in its manufacture.

I attain these objects by the device illustrated in the accompanying drawings,wherein like letters of reference indicate similar parts in the several views, and in which- Figure 1 is a front elevation of myimproved crank,with a portion thereof broken away. Fig. 2 is a detail view in side elevation `of the internal mechanism or angle-block.

A indicates awheel of ordinary form of con- `struction, which may have a plane periphery or be provided with cogs, as may be desired, and which has an annular recess formed in one side and adapted to be monnted uponfa shaft' in connection with any desired machine with which it isapplicable to use the same.

An angle-block, B, is mounted in the annnlar portion of the 'wheel A, and secured on the end of 'the shaft thereof by means of a capplate, b, and Va screw, b', passing through said cap-plate and angle-block and into the shaft,

upon which they are monntcd.` The angleblock B is construeted of metal, and is cast with two projecting arms, 1 and 2, which extend outward at right angles or nearly right 5 5 angles to the shaft and to themselves, and uniting in an elbow which is seeur-ed to the shaft, as heretofore described. The outer ends,

3 and Li, of the said arms 1 and 2 engage with the inner periphery of the wheel A, and the lower'portion of each ofsaid arms 1 and 2 r have shoulders 5 and 6 formed thercwith, which are provided with reccsses or mortises, for a purpose which wil'l be more fully hereinafter described.

Two arms, 7 and 8, are constructed, which are provided with enlarged outer ends, 9 and 10,` which are also adapted to engage with the inner periphery of the wheel A. The arms 7 and 8 are formed' with tenons at their lower portions, which are adapted to enter the recesses or niortises formed in the Shoulders 5 and 6, and pivotally secured therein byv the pivots '11 and 12.. The arm 7 is provided with a series of two or more apertures, 13, with which a removable wrist-pin, 14, engages, and seen red therein by suitable means, and, asshown in the drawings, ismountedin the upper apertnre of said series. By means of this removable wrist-pin 14 the stroke of the crank can be 8G readily adjusted to different lengths, as may be desired, and which will be readily understood. i

The arm S is of smaller dimensions than the arm 7, and acts as a back-stop to prevent the backward motion of the entire angle-block B. Between the inner rear side of the said arm 8 and the outcr side of the arm 2 a flat spring,

15, is interposed, the lower portion of which rests in the recess formed in the shoulder 6, go and the outer end thereofengages with a small shoulder, 16, formed on the outcr inside por,- tion of the arm 8. By means of this spring 15 the arm 8 is held out slightly away from the arm 2, and is caused to impinge against the inside periphery of the wheel A.

The arm 7 is supported only by the pivot 11, and is constructed to normally lie close to the arm 1. Adjacent to the upper portions of each of the arms 1 and 2 screws 17 and 18 pass :oo through the said arms, having entrance therein from the sides thereof opposite to the sidcs adjacent to the arms 7 and S. The normal operation of the angle-block is in the direction of the arrow, as shown in the drawings, the said block being prevented from slipping in the reverse direction by the binding of the outer ends of the arms 7 and 8 against the periphery, and especially of the spring-aotuated arm S, which bcars continually upon the said periphery. By causing the screws 17 and 18 to impinge against the two arms 7 and S they are forced away from the arms 1 and 2, and the outer cnds of the said arms 7 and S are forccd to bear firmlyagainst the inner periphery of the wheel A, thereby converti ng the device into a. single-aeting crank. When the block L, of the construction heretofore described, is mounted on the shaft of a suitable wheel, A, a thin metallic ringplate, O, is secured on the side of the wheel A, by means of the screws c,:over the said block B, and in such a manner that it will slightly project inward over the inner periphery of the wheel and form a llange which acts to retain the said block B in its relatively Operating position in the wheel A.

The outer periphery of the wheel A maybe provided with a eoggcd surface, and thereby adapted to mesh with suitable gearing, and power applied through the medium thereof to the said wheel A.

In the use of this device, in connection with rock and oil-well drilling machinery the drillrope I) will be attached directly to the wristpin 14;, and pass thence over a small sheave or pulley placed in the frame-work of the inaehine in any suitable position above said wrist-pin. As the wheel A is revolved byits shaft, the' angle-bloek B revolves therewith until it reaches about the point diamctrically opposite to the position of the said block, as shown in Fig. 1, when it will slide forward to the position shown in said figure. This sliding movelnent of the angle-block B oceurs at each hal f-revolution of the wheel A, thus giving two drops to a single revolution of the said wheel. y this means an effective doubleacting crank is secured, which is spccially useful in connection with all kinds of welldrilling machinery, as the drill motion is increased thereby to just double the speed now given by the constructions generally used.

It will be understood that the out-cr enlarged ends of the arms 1, 2, 7, and 8 in the operationof a double stroke just touch the inner periphery of the wheel A and freely slide in the channel or groove .formed by the said inner periphery and the plate C.

The wheel entire and the angle-block B move or revolve in the dircction of the arrow; but the angle block B slides forward when it reaehes a point diametrically oppositc to that shown faster than the wheel rcvolves and assumes its former position on the wheel, as represented. This is accomplished through the medium of the drill rope or pitman D, adapted to bc seeured to the wrist-pin 1-1, as follows: W'hen the wheel A starts to revolve, the block B also moves in the same dircction, and the rope or pitman D, drawing upward on the wrist-pin 14, canses the arm 7 to bind against the inner periphery of the wheel A by slightly pulling it away from the arm 1. The pitman or rope D continucs to draw upward on the wrist-pin 14, and causes an impingement of the outcr end of the arm 7 against the inner periphery of the wheel A until a point diametrieally opposite to the starting-point, as shown, is reached, when the said arm 7 is drawn forward against the arm 1, and when thus released there is no binding between the inner periphery and any of the arms of the block ll, and the block entire will slide forward to the starting-point, moving in the same direetion that the wheel is revolving, butat a much morerapid rate of speed. lVhcn the starting-point is reachcd, the arm 7 is again impinged against the peripheryof the wheel, and the same operation is the result. The arm 8 acts mercl y as a brake to prevent the block from slipping backward, which is due to the action of the spring 15 pressing the said arm outward and causing it to bear against the periphery of the wheel A. Then there is a tendency on the part of the arm 8 to slide backward, the outer end thereof impinges against the periphery of the wheel and stops this tendency; but when the block B moves in the dircction of the arrow the arm S is pressed inward against the arm 2, and the outer end of the said arm S is discngaged Vfrom the periphery of the wheel, and thus the block freely slides, as before set forth,

In converting this device into a single-acting Crank, the screws 17 and 18 are caused to impinge against and force the arms 7 and S outward away from the arms 1. and 2 of the block B and force them firmly against the inner periphery of the wheel A, thereby preventing the block from slipping on thehalfrevolution, as heretofore described, but turning` with the wheel A in its entire revolution.

It is obvious that many minor changes in the construction and arrai'igemcnt of the parts could be made and substituted for those shown and described without in the least departing from the nature and principle of my invention.

Having thns described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. In a double-aeting crank convertible into a single-aeting crank, the combination of a wheel adapted to be mounted on a shaft, an angle-block having arms mounted in saidv wheel, and means, as set forth, for securing the several parts, substantially as described.

2. In a double-acting crank convertibleinto a singleacting crank, the combination of a wheel mounted upon a shaft, an angle-block provided with arms mounted insaid wheel and upon. the shaf t thereof, movable arms pivotally mounted in recesses in said angle-block and adapted to engage with the inner surface of the rim of the wheel, and means, as set forth,

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for securing the several parts, substantiall y 'as deseribed.

3. In a double-acting crank oonvertible into a single-acting orank, the combination of a wheelmounted upon a shaft, an angle-bloek provided with arms adapted to engage with the inner periphery of and mounted in said Wheel and upon' the shaft thereof, suitable recessed Shoulders formed on, said angle-block, arms pivotally mounted in said recesses and engaging with the inner surface of the rim. of the wheel, a spring interposed between one of the said arms and one arrn of the angle-block, and a ring-plate for seouring the angle-blo'ok in the wheel, substantially as described.

4. In a double-acting crank oonvertible into a single-aoting Crank, the combination, with a wheel, of an augle-block provided with arms mounted in said wheel and upon the shaft thereof, arms 7 and 8, mounted in recesses in the angle-block Shoulders, and screws 17 and 18, passing through the said angle-arrns and adapted to impinge against the arms 7 and 8 and eonvert the cranl: from a double to a single acting orank, substantially as deseribed.

5. In a double-aeting crank convertible into a single-acting Crank, the combination of a Wheel, A, mouuted on a shaft, an angle-blook, B, having arms l and 2, and provided with recessed Shoulders 5 and 6, mounted -in said wheel A and upon the shaft thereof, arms 7 and 8, pivotally mouuted in said recessed shoulders 5 and 6 and engaging at their outer, ends with the inner surface of the rim of the wheel A, a spring, 15, interposed between the arms 2 and 8, the sorews 17 and' 18, and the ring-'plate C, all arranged and Operating substantiall y as described.

In testimony whereof I affix my signature in presenee of two witnesses.

J ACOB S. BROVVN.

Witnesses:

B K. GOODYEAR, J. P. BRINDLE. 

